Evidence for magnetic-field-induced anisotropy of the interstellar medium

Details Evidence for magnetic-field-induced anisotropy of the interstellar medium Evidence for magnetic-field-induced anisotropy of the interstellar medium

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994natur.372..754d&link_type=abstract

Nature, Volume 372, Issue 6508, pp. 754-756 (1994).

Computer Science

21

Scientific paper

TURBULENCE in the interstellar medium transfers energy from parsec-sized regions to much smaller scales, and may be respon-sible for supporting clouds against gravitational collapse1. Fluctua-tions in the electron density, which trace turbulence, occur on scales ranging from 106 to >1013 cm—the largest range of spatial scales seen in natural turbulence. Despite almost thirty years of study, however, the causes and effects of interstellar turbulence are still poorly understood. Here we present observations of OH masers in the Galactic star-forming complex W49N, which we use as point sources to investigate scattering along the line of sight. The masers' images are elliptical, and aligned roughly perpendicular to the Galactic plane. This alignment suggests that the magnetic field of our Galaxy influences interstellar turbulence2'3 by mediating the transfer of energy from large to small spatial scales.

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